Jem Costello is a fictional character from the British Channel 4 soap opera Hollyoaks, played by Helen Russell-Clark. She made her first on-screen appearance on 5 March 2010. It was later announced that Jem had been written out of the serial, and the character would leave in November 2010. Russell-Clark made her final appearance as Jem on 30 November 2010. Character creation and casting In December 2009, in an interview with entertainment website Digital Spy series producer Lucy Allan revealed that there would be a new female arriving in Hollyoaks who would be a threat to Steph Cunningham (Carley Stenson) and Cheryl Brady (Bronagh Waugh). The character of Jem Costello was created as the new love interest of already established character, Gilly Roach (Anthony Quinlan). It was announced in early 2010 that Hollyoaks series producer Lucy Allan had cast television newcomer Helen Russell-Clark in the role of Jem having previously auditioned for the role of Rae Wilson. Russell-Clark was initially signed to a six-month contract. In January 2010, it was announced that Lucy Allan had stepped down from the position of series producer and that Paul Marquess had taken over the role. It was soon revealed that Marquess planned to give Hollyoaks a "shake up", changing the productions team and beginning a cast cull by axing three established characters. In April 2010, it was announced that Marquess would introduce a second new family after the Sharpe clan, the Costello's consisting of mother Heidi (Kim Tiddy), father Carl (Paul Opacic), sons Riley (Rob Norbury) and Seth (Miles Higson) and daughter Jasmine (Victoria Atkin). It was later revealed that Jem would be a part of the Costello family after previously been given the surname by Lucy Allan. Jem transpired to be the daughter of Carl, the stepdaughter of Heidi and the half sister of Riley, Seth and Jasmine. Before her family arrived, Jem revealed her mother had died when she was young. Character development Speaking to OK! of her character, Russell-Clark stated, "Well, Jem’s well into her martial arts – as I am, which means you’ll be seeing lots of fight action. In fact, the first thing you really see of me is my hand hitting someone, but it’s all in self-defence!" In March 2010, in a video interview with Hollyoaks Backstage, Russell-Clark introduced her character and described her personality, she said, "Jem is a bit of a free spirit, she loves